System Sensor 5601P Mechanical Heat Detector

System Sensor 5601P is a 135°F (57°C) Fixed Temperature / 15°F (8.3°C) Rate-of-Rise Mechanical Heat Detector; Single circuit type, normally open. The 5601P is part of System Sensor's 5600 Series of Mechanical Heat Detectors. A reversible mounting bracket (included) permits both flush- and surface-mount back box installations. Mounts to: — 3½-inch octagonal back box — 4-inch octagonal back box — Single gang back box — 4-inch square back box with a square to round plaster ring NOTE: The System Sensor 5601P can be used to replace the obsolete model 5601.